Bugfixes and better rotation handling.

* Fixed global shortcuts which were broken with the last commit.
* Fixed and improved auto-rotation which now uses the current screen rotation on startup to determine the correct tablet orientation.
* All rotation settings are now handled by the "Rotate" property.
* Tablet area selection should now work properly.
* Deprecated a lot of properties which are probably no longer necessary and which will be removed soon.
* Tablet area mapping is now handled by the Area property and no longer by the TabletArea property.